BDTS and system restore,could you explain me the best way to restore my OS?

I've recently performed a system restore from a restore point saved,the reason was that I've suddenly lost all my tabs opened in my Opera browser and I can't find them anymore (I haven't saved them in bookmarks or other locations),I've had some trouble during the process with that error caused by Birdefender that doesn't let you perform the restoration unless you uninstall it as it is explained here :

I've tried the 2 methods and now I've restored following num 1 : runned Bitdefender Uninstalling Tool,rebooted in safe mode,performed the system restore from the selected restore point, rebooted again in normal mode and runned again the tool. Now I've not already reinstalled the av because I wasn't been able to regain these opened tabs in my Opera after the restoration (I'm working on a solution but if you have some ideas I'll appreciate), so I'm thinking to try again to restore from this restore point or from another previous one,all that said, at this point it is necessary to reboot again in safe mode to restore from a restore point or I can do that also in normal mode ( consider that at this point I've not reinstalled BDTS ) ?

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